Preferred brand of Backflow preventer

I have a 17 year old Conbraco 1"back flow preventer that needs a new freeze plug assembly. From what I can tell, this one has been discontinued, but I think I can get parts. But for what they cost, I was thinking of replacing the whole thing. I'm located in NE Nebraska, do I stay with same brand or is there a more preferred brand? Accessabiliy, reliability, parts?